package com.singzi.javaSenior.threads.threadLocal;

import java.util.concurrent.TimeUnit;

public class Main {
//    get()方法调用时会进行初始化（如果 set 方法没有调用），每个线程会调用一次
    private static final ThreadLocal<Long> TIME_THREADLOCAL = new ThreadLocal<Long>();
    protected Long initialValue() {
        return System.currentTimeMillis();
    }
    public static final void begin() {
        TIME_THREADLOCAL.set(System.currentTimeMillis());
    }
    public static final long end() {
        return System.currentTimeMillis() - TIME_THREADLOCAL.get();
    }
    public static void main(String[] args) throws Exception {
        Main.begin();
        TimeUnit.SECONDS.sleep(1);
        System.out.println("Cost: " + Main.end() + " mills");
    }
}
